1 /* The fake debug assert instructions
3 * Copyright 2010 Analog Devices Inc.
5 * Licensed under the GPL-2 or later
8 #include <linux/types.h>
9 #include <linux/kernel.h>
10 #include <linux/ptrace.h>
13 * Unfortunately, the pt_regs structure is not laid out the same way as the
14 * hardware register file, so we need to do some fix ups.
16 static bool fix_up_reg(struct pt_regs *fp, long *value, int grp, int reg)
20 /* Only do Dregs and Pregs for now */
24 if (grp == 0 || (grp == 1 && reg < 6))
25 val -= (reg + 8 * grp);
26 else if (grp == 1 && reg == 6)
28 else if (grp == 1 && reg == 7)
36 #define PseudoDbg_Assert_opcode 0xf0000000
37 #define PseudoDbg_Assert_expected_bits 0
38 #define PseudoDbg_Assert_expected_mask 0xffff
39 #define PseudoDbg_Assert_regtest_bits 16
40 #define PseudoDbg_Assert_regtest_mask 0x7
41 #define PseudoDbg_Assert_grp_bits 19
42 #define PseudoDbg_Assert_grp_mask 0x7
43 #define PseudoDbg_Assert_dbgop_bits 22
44 #define PseudoDbg_Assert_dbgop_mask 0x3
45 #define PseudoDbg_Assert_dontcare_bits 24
46 #define PseudoDbg_Assert_dontcare_mask 0x7
47 #define PseudoDbg_Assert_code_bits 27
48 #define PseudoDbg_Assert_code_mask 0x1f
53 bool execute_pseudodbg_assert(struct pt_regs *fp, unsigned int opcode)
55 int expected = ((opcode >> PseudoDbg_Assert_expected_bits) & PseudoDbg_Assert_expected_mask);
56 int dbgop = ((opcode >> (PseudoDbg_Assert_dbgop_bits)) & PseudoDbg_Assert_dbgop_mask);
57 int grp = ((opcode >> (PseudoDbg_Assert_grp_bits)) & PseudoDbg_Assert_grp_mask);
58 int regtest = ((opcode >> (PseudoDbg_Assert_regtest_bits)) & PseudoDbg_Assert_regtest_mask);
61 if ((opcode & 0xFF000000) != PseudoDbg_Assert_opcode)
64 if (!fix_up_reg(fp, &value, grp, regtest))
67 if (dbgop == 0 || dbgop == 2) {
68 /* DBGA ( regs_lo , uimm16 ) */
69 /* DBGAL ( regs , uimm16 ) */
70 if (expected != (value & 0xFFFF)) {
71 pr_notice("DBGA (%s%i.L,0x%x) failure, got 0x%x\n", grp ? "P" : "R",
72 regtest, expected, (unsigned int)(value & 0xFFFF));
76 } else if (dbgop == 1 || dbgop == 3) {
77 /* DBGA ( regs_hi , uimm16 ) */
78 /* DBGAH ( regs , uimm16 ) */
79 if (expected != ((value >> 16) & 0xFFFF)) {
80 pr_notice("DBGA (%s%i.H,0x%x) failure, got 0x%x\n", grp ? "P" : "R",
81 regtest, expected, (unsigned int)((value >> 16) & 0xFFFF));
90 #define PseudoDbg_opcode 0xf8000000
91 #define PseudoDbg_reg_bits 0
92 #define PseudoDbg_reg_mask 0x7
93 #define PseudoDbg_grp_bits 3
94 #define PseudoDbg_grp_mask 0x7
95 #define PseudoDbg_fn_bits 6
96 #define PseudoDbg_fn_mask 0x3
97 #define PseudoDbg_code_bits 8
98 #define PseudoDbg_code_mask 0xff
101 * DBG - debug (dump a register value out)
103 bool execute_pseudodbg(struct pt_regs *fp, unsigned int opcode)
108 if ((opcode & 0xFF000000) != PseudoDbg_opcode)
112 grp = ((opcode >> PseudoDbg_grp_bits) & PseudoDbg_reg_mask);
113 fn = ((opcode >> PseudoDbg_fn_bits) & PseudoDbg_fn_mask);
114 reg = ((opcode >> PseudoDbg_reg_bits) & PseudoDbg_reg_mask);
116 if (!fix_up_reg(fp, &value, grp, reg))
119 pr_notice("DBG %s%d = %08lx\n", grp ? "P" : "R", reg, value);